κελεύθους, from Crisa
to Mycenae: δεινοτάτας, since the
expected avenger returns as dust. For the poetical plur., cp. 68ταῖσδε ταῖς ὁδοῖς. The plur.
might, indeed, mean the journey from Mycenae to Phocis, and the
return; but this is less natural.